摘要
针对7A04CS板材加工的零件在硫酸阳极化铬酸盐填充后局部表面颜色发黑问题,采用金相分析、化学分析及力学性能试验等分析手段,经综合分析得出主要原因是:挤压变形时原始组织中粗大的块状第二相和较多的晶界析出物偏析残留,在固溶热处理时没有充分溶解,在阳极氧化反应中优先溶解,膜层表面出现凹坑,造成了零件阳极氧化表面颜色发暗发黑。采用二次热处理(淬火+人工时效)消除板材原始组织微量偏析,此故障现象消失。
The color of local surface film on of 7A04CS plate parts is dark after sulphuric acid anodizing and Chromate filling.By means of mechanical performance test,metallographic and chemical analysis,the comprehensive analysis is conclude.Oversize block second phase of original structure and grain boundary segregation has't been fully dissolved during the thermal treatment process,and they are preferential dissolved in the anodic oxide process.Pits appear on oxide film,leading to darken the color of local surface film.When second thermal treatment removes the segregation,then the phenomena of failure disappeared.
作者
张华云
任卫斌
刘治国
ZHANG Huayun;REN Weibin;LIU Zhiguo(Aviation Industry Missile Institute,Luoyang 471003,China)
出处
《电镀与精饰》
CAS
北大核心
2022年第7期70-73,共4页
Plating & Finishing
